Whoa. You're saying you put ~55,000 on a single top end? Wow. Nice work.
My bad. I pulled the top end again at around 30,000, cleaned the exhaust valves, and put a new piston, rings, and small end bearing in place.
There's 30,000 on the current engine. As, you can see on the video, it's pulling fine and there's no excessive smoke, so I will leave it be for the time being even though I was planning a complete strip down at 60k.
The carbureter manifolds are prone to crack and leak, so I have been changing them quite often.